/**
 * 自定义代码高亮插件
 */
import hljs from 'highlight.js'
import 'highlight.js/styles/vs.css'

const install = function (Vue) {
    Vue.directive('highlight', {
        deep: true,
        bind (el, binding) {
            // on first bind, highlight all targets
            let targets = el.querySelectorAll('code')

            targets.forEach(target => {
                if (typeof binding.value === 'string') {
                    // if a value is directly assigned to the directive, use this
                    // instead of the element content.
                    target.textContent = binding.value
                }
                hljs.highlightBlock(target)
            })
        },
        componentUpdated (el, binding) {
            // after an update, re-fill the content and then highlight
            let targets = el.querySelectorAll('code')

            targets.forEach(target => {
                if (typeof binding.value === 'string') {
                    // if a value is directly assigned to the directive, use this
                    // instead of the element content.
                    target.textContent = binding.value
                    hljs.highlightBlock(target)
                }
            })
        },
    })

}

if (window.Vue) {
    window['highlight'] = highlight
    Vue.use(install) // eslint-disable-line
}

export default install
